According to the brochure about the Heritage Parks of Moreton Bay, including Fort Lytton National Park, the area is the site of remnants of a colonial coastal fortress and quarantine station.
It is near the southern side of the mouth of the Brisbane River, just 18 kms downstream from the city.
The site "played an important strategic role in guarding against attacks from enemy ships and preventing diseases spreading from a thriving population."
The Park is open each Sunday, and on the first Sunday of each month, there is a reenactment and some of the cannons are fired.
It is an interesting place along with the Museum, and a pleasant picnic area too, being right on the river.
For more information Ph (07) 3393 4647.